RTC AP21 Series Operation manual

OPERATION/SERVICE MANuAl
AP21
021020 /19125
RTC-TRAFFIC.COM
For Version 3.02 and higher.

02
AP21 Programming Manual
AP21 TABLE OF CONTENTS
PROGRAMMING MANUAL
Introduction 1
Specifications: Electrical/Physical 1
Programming Features 1
Power Fail Backup 2
Accuracy 2
Wiring 2
AP21 Octal Base Mount Pin 2
Display and Keyboard Descriptions 3
Programming Instructions 4
Programming Sequence 4
Display and Special Key Codes 5
Time Switch Keys 5
QUICK REFERENCE PROGRAMMING GUIDE
Program/Edit Time-Of-Day 6
Program/Edit the Date 7
Program/Edit the Day-Of-Week 7
Program/Edit Daylight Saving Time 8
Program/Edit Basic Program Steps 9/10
Program/Edit Annual Plans 10/11
Activate/Deactivate Sleep Mode 12
Program/Edit Pulse Rate 12
Manual Operate the Output Relay 12
Adding Seconds to the Time Display 12
Transfer Program to another AP21 12
WARRANTY 13
SERVICE / THEORY OF OPERATION Back Cover

1
AP21 Programming Manual
INTRODUCTION
The AP21 is an single circuit, calendar-programmable solid state time switch used for switching electric circuits
according to pre-set time and date program. The AP21 is primarily designed for school zone and traffic control use where
multiple daily/weekly programs are required on an annual basis. The relay output can be programmed for momentary
operation for bell or buzzer operation in schools, churches, or industrial facilities.
ELECTRICAL SPECIFICATIONS
 PowerRequirements: •95VACto135VAC,60HZ.,3VAmaximum10.5VDCto14.3VDClessthan
1 watt through full range of supply voltage (0.2 to 0.58 average)
 Outputs:  •AP21,SPDTrelayratedat15AMPresistiveat120VAC
 Wiring:   •Terminalblockcanaccommodate#12to#24AWGwire
PHYSICAL SPECIFICATIONS
 Dimensions:  •3.7”Wx8.0”Hx1.55”D
 Weight:   •Approximately2pounds
 Mounting:  •Pre-drilledmountinghole(AP21)
 OperatingTemperature: •-30˚to+74˚C
PROGRAMMING FEATURES
AUTO PROMPTING DISPLAY — The display provides information to guide the operator through programming.
Upon power-up, it will prompt the operator through setting the time and basic programming sequence.
DAY PLAN — The Day Plan is made up of the programmed steps that will take place on the assigned days and control the
output relay. The Day Plan can be assigned to all days, just week days, just weekends, or specific days of the week.
16 PROGRAM STEPS — The Day Plan can hold up to 16 program steps. The 16 program steps are used to program
ON/OFF times for the relay.
ANNUAL “SKIP” PLAN—TheAP21canholdupto10Annual“Skip”Plans,whicharedatesordaterangesthatwill
receive no programming steps. Annual plans are used for special events such as holidays or spring break, throughout the
calendarthatdifferfrom“normal”DayPlanscheduling.
PROGRAMMABLE DAYLIGHT SAVING TIME ADJUSTMENT — The AP21 automatically adjusts for daylight saving time
changes according to U.S. law. Re-programmable if law changes.
AUTOMATIC LEAP YEAR COMPENSATION —Perpetualtypecalendartoadjustfortheextradayevery4years.
TRANSFER — Allows program data to be transferred from one AP21 to another or from a computer to an AP21.
MANUAL OVERRIDE — The output relay can be manually activated or deactivated from the keyboard. The manual override
willremainineffectuntilthenextprogrammedstepoccurs.
SLEEP MODE — Deactivates relay output while maintaining all timing data during summer vacation.
PULSE OUTPUT — The output can be programmed to operate as constant contact or a momentary contact programmable
from 1 to 99 seconds.

2
AP21 Programming Manual
13 N/U N/U
14 N/U N/U
15 N/U N/U
16 N/U N/U
POWER FAIL BACKUP
Program and time keeping is maintained for 48 hours on a rechargeable capacitive backup system in the event of a power
failure. The output and display are disabled during backup. The AP21 resumes normal operation when power is restored.
ACCURACY
TIME KEEPING — Synchronous with the AC power line and 4 PPM on DC power. During a power failure it is quartz crystal
controlledwithanaccuracyof+/-.005%throughoutitsfulltemperaturerange.
PROGRAMMED EVENTS — On/Off events are programmable with a one minute resolution and occur at the zero second
of that minute.
WIRING
WARNING:Disconnectpowerbeforewiringconnection.Observeallsafetyprecautions.
AP21
TERMINAL BLOCK
 AC– AC+ GND +12V –12V N/O N/C COM
Relay
Moveable
(IN)
Relay
N/O
(OUT)
PIN # WIRE COLOR
TXDOT WIRING AP2T/CPR
FUNCTION
1 Black 120 VAC
2 White AC - (Neutral)
3 Green Chassis Ground
4 Red Relay N/O
5 Yellow Relay N/O
6 N/U N/U
7 N/U N/U
8 N/U N/U
9 N/U N/U
10 White/Yellow Relay Common
11 White/Red 12V DC+
12 White/Black 12V DC Common
13 Black/Red 12V DC–
14 N/U N/U
15 Red 12V DC+
16 N/U N/U
PIN # WIRE COLOR
STANDARD WIRING AP2T/CPR
FUNCTION
1 Black/White 120 VAC
2 White AC - (Neutral)
3 Green Chassis Ground
4 Yellow/Black Relay Common
5 Yellow Relay N/O
6 N/U N/U
7 N/U N/U
8 N/U N/U
9 N/U N/U
10 Yellow/White Relay N/O
11 N/U N/U
12 N/U N/U
AP21TR OCTAL BASE MOUNT PIN OUT (discontinued product, unavailable for a new installation)
ToinstalltheAP21TRrequiresaneight-pinoctalbasesuchasaPotterandBrumeld#27E122orequivalent.Mountthis
base in a suitable location and wire the terminals of the base as follows:
AC VERSION DC VERSION
1. Relay Common 1. Relay Common
2. Line 2.
3. Relay normally open 3. Relay normally open
4. Relay normally closed 4. Relay normally closed
5. 5.
6.    6.–12VDC
7. Neutral 7.
8.    8.+12VDC

3
AP21 Programming Manual
DISPLAY AND KEYBOARD DESCRIPTIONS
ALPHA-NUMERIC DISPLAY – Used for displaying time, day, date, output status and for
displaying information during programming or reviewing stored programs.
KEYBOARD – Many of the AP21 keys serve multiple functions. Those keys are clearly labeled
with their functions printed adjacent to the key. They cannot be used incorrectly as the
display will AUTO PROMPT the user as to which key to press.
AM/ON (1) KEY – Used for setting time to AM when in the time set or programming modes.
Also used for setting output to ON or OFF when in the programming mode. Also used for
setting the output to ON manually.
PM (2) KEY – Used for setting the time to PM when in the time set or
programming modes.
TIME (3) KEY – Used for entering the set time mode.
ANNUAL (A) KEY – Used for entering the annual programming mode and for stepping
through the stored annual programs for review. The annual programs contain the skip
plans in calendar schedule form.
BASIC (B) KEY – Used for entering the basic programming mode and for stepping
through the stored basic programs for review. The basic programs contain the daily
timed events instructions.
CLEAR (C) KEY – Used for clearing all annual skip plans and basic program steps.
DATE (D) KEY – Used for entering the set date mode for entering date or reviewing the date.
EXIT (#) KEY–Usedforexitingthesettime,setdate,orprogrammode.
OFF (0) KEY – Used for setting the output to OFF when in the programming mode. Also used for setting
the output to OFF manually.
STEP/ENTER (*) KEY – Used for entering all commands and for stepping through the set time, set date
or program data entry.
DST (7) KEY – Used for entering or changing the daylight savings time program.
DAY (4) KEY – Used for setting the current day of the week.
PULSE (5) KEY – Used for programming the output relay on for a specific time period (bells,
sirens, etc.).

4
AP21 Programming Manual
PROGRAMMING SEQUENCE
1CREATE
DAY PLANS 2CREATE ANNUAL PLAN
•ChooseStepNumber
•ChooseTime
•ChoosetoTurnRelay
On or Off
•ChooseException
•ChooseStartDate
•ChooseEndDate
PROGRAMMING INSTRUCTIONS
THE AP21 CURSOR — On many of the AP21 display screens you will see a flashing square character called the cursor. The
cursor indicates that you may now enter or change the data at that position of the display.
AUTO PROMPT DISPLAY — On a cold start with a discharged back-up capacitor, the AP21 will automatically prompt the
operator through the programming procedure. The operator simply has to follow the display and enter the appropriate data as
thecursoradvancesthroughtheprogramentries.YoumayexitthissequenceifdesiredbypressingtheEXIT(#)keyandthe
unit will default to the time display mode. From the time display mode, you may enter any of the set time, date, or program
modes manually.
ENTERING DATA — From the cursor, you enter the appropriate data and press the ENTER () key. The cursor will automatically
advancetothenextposition.Ifthedataatthecursoriscorrect,simplypresstheENTER () key to advance the cursor. The
AP21 will not allow you to enter an invalid number (i.e., the unit will not accept the number 13 for a month entry). The cursor
will remain in its position until a valid entry is made, so keep pressing the keys until you see the correct number at the cursor
and then press the ENTER () key.

5
AP21 Programming Manual
DISPLAY KEY CODES
= ENTER
WDY = Mon thru Fri
MM = month of the year
EDY = every day of the week
DD = day of the month
WND = Sat and Sun only
YY = year
HH = hour of the day
MM = minute of the hour
SUN = the Sunday of the month for DST change
1= first Sunday 4= fourth Sunday
2= second Sunday L= last Sunday
3= third Sunday
SPECIAL FUNCTION CODES
0= Manual operation is set to OFF
1= Manual operation is set to ON
7= DST (daylight saving time change)
45 = Sleep Mode (disables output relay)
77 = Clear all data for reprogramming
78 = Program transfer between AP21 units
99 = Current software version
88 = Prevents the screen from blanking
88 = again allows the screen to blank
HH : MM
— when Colon is Flashing = Display Blanking
— when Colon is Steady = Display “ON” continuously
TIME SWITCH KEYS
1= AM and ON
2= PM
3 = TIME (time-of-day)
4 = DAY (day-of-week)
5 = PULSE (pulse or steady output/s)
7 = DST (Daylight Saving Time)
0 = OFF (relay off)
A = ANNUAL (programs)
B = BASIC (programs)
C = CLEAR (clear all annual or basic programs)
D = DATE (month, day, year)
#=EXIT(exittothetimedisplaymode)
= ENTER (enter the data at the cursor)

6
AP21 Programming Manual
AP21 QuICK REFERENCE PROGRAM GuIDE
NOTE: The display of the AP21 will automatically blank after about 5 minutes of keyboard inactivity, simply press any key
to reactivate the display.
Start programming from the MAIN DISPLAY.
PROGRAM THE TIME-OF-DAY
— From the MAIN DISPLAY, press key 3(TIME) then ENTER ().
Enter the time-of-day as iillustrated at right: HH MM AM/PM 
Note: = ENTER
> To Review Or Change The Time-Of-Day
From the Time Display Mode:
· Press TIME (#3) and then press ENTER (),thecursorwillbeattheHOURposition
· Press ENTER ()iftheHOURdisplayediscorrect,orkeyinthecorrectHOURandpressENTER (),
the cursor will now advance to the MINUTE position
· Press ENTER () if the MINUTE displayed is correct, or key in the correct MINUTE and press ENTER (),
the cursor will advance to the AM/PM position
· Press ENTER () if the AM/PM displayed is correct, or key in the correct AM/PM and press ENTER (),
the new time will begin and the display will return to the Time Display Mode

7
AP21 Programming Manual
PROGRAM THE DAY-OF-WEEK
— From the MAIN DISPLAY, press 4(DAY) then ENTER ().
Enter the day-of-week as iillustrated at right:
Note: Press key 4(DAY) until the correct day appears.
Day-of-week 
Note: = ENTER
PROGRAM THE DATE
— From the MAIN DISPLAY, press D (DATE) then ENTER ().
Enter the date as iillustrated at right: MM DD YY 
Note: = ENTER
> To Review Or Change The Date
From the Time Display Mode:
· Press DATE (D) and then press ENTER (),thecursorwillbeattheMONTHposition
· Press ENTER ()iftheMONTHdisplayediscorrect,orkeyinthecorrectMONTHandpressENTER (),
the cursor will now advance to the DAY position
· Press ENTER () if the DAY displayed is correct, or key in the correct DAY and press ENTER (),
the cursor will advance to the YEAR position
· Press ENTER () if the YEAR displayed is correct, or key in the correct YEAR and press ENTER (),
the display will return to the Time Display Mode
> To Review Or Change The Day-Of-Week
From the Time Display Mode:
· Press DAY (#4) and then press ENTER (),thecursorwillbeattheMONTHposition
· Press ENTER ()iftheDAYOFTHEWEEKdisplayediscorrect,oradvancetothecorrectDAYOFTHEWEEKby
pressing DAY (#4)repeatedlyuntilthecorrectDAYOFTHEWEEKisdisplayed,andthenpressENTER (),
the display will return to the Time Display Mode

8
AP21 Programming Manual
PROGRAM DAYLIGHT SAVING TIME (DST)
— From the MAIN DISPLAY, press key 7(DST) then ENTER ().
Enter the spring and fall Daylight Saving Time as iillustrated
at right:
Note: The AP21 will default to the current U.S. standards:
S(Spring), M = 03 (March), SUN = 2(second Sunday)
F(Spring), M = 11 (November), SUN = 1(first Sunday)
To change the month, simply key in the new month and press ENTER ().
To change to another Sunday of the month, key in the Sunday of the
desired month by entering:
1first Sunday
2second Sunday
3third Sunday
4fourth Sunday
5last Sunday
Then press ENTER ().
To disable DST, enter the Spring month as 0.
S DST: MM SUN 
F DST: MM SUN 
Note: = ENTER
> To Review Or Change Daylight Saving Time
From the Time Display Mode:
· Press DST (#7) and then press ENTER ()
SPRING DST will appear on the display
· Press ENTER ()iftheMONTHdisplayediscorrect,orkeyinthecorrectMONTHandpressENTER (),
the cursor will advance to the SUNDAY position
NOTE: To bypass the DST feature, enter 00 and press ENTER ()
· Press ENTER () if the SUNDAY displayed is correct, or key in the correct SUNDAY and press ENTER ()
FALL DST will appear on the display
· Press ENTER ()iftheMONTHdisplayediscorrect,orkeyinthecorrectMONTHandpressENTER (),
the cursor will advance to the SUNDAY position
· Press ENTER () if the SUNDAY displayed is correct, or key in the correct SUNDAY and press ENTER (),
the display will return to the Time Display Mode